Cotinus coggygria 39royal purple39 produces rounded rich purple leaves which take on a fantastic red colouring in autumn in summer large wispy clusters of pink flowers appear which take on a tan colour in autumn and give rise to the common name smoke bush or smoke tree deservedly popular this large deciduous shrub grows well in almost any soil and requires little pruning alternatively it can be pruned hard every few years to produce a smaller shrub with larger attractive leaves